A search for the Standard Model (SM) Higgs boson decaying into a pair of τ leptons is presented. The results are based on data samples of proton-proton collisions accumulated by ATLAS experiment at the LHC and corresponding to integrated luminosities of 4.6 fb−1 and 13.0 fb−1 at center-of-mass energies of √s = 7 TeV and 8 TeV, respectively. The observed (expected) upper limit at 95% C.L. on the cross-section times the branching ratio for SM H → τ+τ− is found to be 1.9 (1.2) times the SM prediction for a Higgs boson with mass mH = 125 GeV. For this mass the observed (expected) deviation from the background-only hypothesis corresponds to a local significance of 1.1 (1.7) standard deviations.

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